Machine for use in the manufacture of shoes



' ze'ss July 1, 1941. l R L W 0 2247.443

MACHINE FOR USE IN THE MANUFACTURE OF SHOES Filed Sept. 5, 1940 3Sheets-Sheet l 2, Q o Y s 6 64 60 O Q l O I; 62 40 2 E: 6\ e 55 2 24 Q52 5 :5 O 48 July 1', 1941. R. H. LAWSON MACHINE FOR USE IN THEMANUFACTURE OF SHOES Filed Sept. 5, 1940 3 Sheets-Sheet 2 July 1, 1941.R. H. LAWSON 3 Sheets-Sheet 3 Filed Sept. 5, 1940 hnwvwhn 4.. m iiMACHINE FOR USE IN THE MANUFACTURE OF SHOES Jmg; 1i-

Patented July 1, 1941 ETD STATES FFIQE MACHINE FOR USE IN THEMANUFACTURE OF SHOES Robert H. Lawson, Beverly, Mass, assignor to UnitedShoe Machinery Corporation, Borough of Flemington, N. J., a corporationof New Jersey Application September 5, 1940, Serial No. 355,431

7 Claims.

The present invention relates to machines for I trolling the relativepositions of the jack and" operating devices as the point of operationof said devices is. transferred along the shoe. The several features ofthe invention are herein disclosed as embodied in an automatic sidelastin machine and are intended primarily as improvements on themachines disclosed in applicants pending application Serial No. 311,794filed December 30, 1939, and applicants Patent No. 2,201,866, dated May21, 1940. It is to be underthe heavy actuated parts in a predeterminedposition. 7

As has been stated, the toggle of the machines of applicants patent andapplication referred to is broken by the return movement of the jack tooperative position, and a further feature of the present inventioncontemplates the provision of lost motion in the connections between thetoggle and the dash pot whereby the toggle is permitted to move from itsstraightened position without interference from the dash pct.

stood, however, that except where so stated in the claims, the severalfeatures of the present invention are not limited to use in anyparticular machines of the general type above referred to.

In the machine of applicants prior application an upward pressure on thejack during the operation on the shoe comprises a spring which, at theconclusion of the operation on the shoe is rendered inoperative and islocked out of operation spring is connected and which is arranged to beflexed more or less during the up and down movements of the jack duringthe operation on the shoe. This toggle, in addition to locking thespring connected to the jack out of operation, is also arranged to forcethe jack outwardly away from operating position at the conclusion of theoperation on the shoe when the toggle is straightened, and is alsoarranged to be broken by the return of the jack inwardly to operativeposition.

The movement of the toggle to straightened position is produced througha lever and link connection from a face cam rotating in unison with theseveral pattern cams from which the relative positions of the operatingdevices and jack are controlled. This movement of the toggle isnecessarily rapid and takes place during a small number of degrees ofrotation of the pattern cam. On account of the weight of the parts andthe necessary rapid movement, difficulty has been experienced instopping the toggle accurately in straightened position withoutproducing an objectionable shock and jar. To over-come this difliculty,a feature 'of the present invention contemplates the provision of a dashpot connected to the toggle and arranged to resist the movement of thetoggle as it nears straightened position and. thereby absorb the shockoccasioned by the sudden stopping of the rapid movement of .20 abovereferred to, the mechanism for exerting .25 by the straightening of atoggle to which the A further feature of the present invention relatesto the construction and operation of the pattern earn from which thestraightening movements are imparted to the toggle. Due to the smallnumber of degrees through which the pattern cam can rotate in actuatingthe toggle and also due to the fact that the cam, before coming to rest,must rotate to a position permitting breaking of the toggle in startingthe machine, the rise on the cams of the machines of the patent andapplication is quite steep, thereby occasioning a noticeable hard spotin the actuating mechanism of the machines. To relieve this hard spot inthe actuation of the toggle, this feature of the present inventioncontemplates providing the toggle actuating pattern cam with a movablesection having a limited movement with relation to the cam and arrangedto be engaged and moved by the follower forming part of the connectionsto the toggle and during such limited movement to impart a toggleactuating movement to the follower.

In the construction hereinafter described, the continued movement of themovable section of the cam is utilized to complete thetoggle actuatingmovement of the follower. As the toggle reaches a straightened position,further actuation of the follower becomes unnecessary, and in order topermit the maximum number of degrees of cam rotation to be utilizedbefore the cam stops in a position to permit movement of the toggle instaiting the machine, the cam surface of the section is so shaped that areturn movement is permitted to the section and a spring is provided forimparting such return movement.

In the preferred form of this feature of the invention the movable camsection consists of a lever pivotally mounted on the toggle actuatingpattern cam for limited swinging movement about an axis parallel to theaxis of the cam, the outer end of the lever being arranged to engage thefollower of the connections to the toggle, and suitable stops beingprovided to limit the movement of the lever in both directions.

The several features of the present invention will be readily understoodby those skilled in the art from the following specific. descriptiontaken in connection with the accompanying drawings, in which isillustrated so much of an automatic side lasting machine as is necessaryto show the connection of the invention therewith.

Referring to the drawings, Fig. 1 is a view in side elevation of themachine with portions of the frame broken away to show underlying parts;

Fig. 2 is a view in side elevation on an enlarged scale of a portion ofthe toggle actuating mecha nism and the connections from the toggle tothe dash pot; Fig. 3 is a. View in side elevation of a portion of themechanism illustrated in Fig. 2 but looking in the opposite directionand showing the dash pot in section and also showing the pattern camfrom which the toggle is actuated; Fig. 4 is a plan view of the partsillustrated in Fig. 3; Fig. 5 is a detail vertical sectional View of thedash pot taken on the line 5$5 of Fig. 3; Fig. 6 is a detail sectionalplan view on the line 6-6 of Fig. '7 illustrating the toggle actuatingpattern cam with its movable section and the follower engaged thereby;and Fig. 7 is a View in sideelevation of the parts illustrated in Fig.6.

The automatic side lasting machine illustrated in the drawings is thesame, except as hereinafter indicated, as the machine disclosed inapplicants prior Patent No. 2,201,866, and more particularly asdisclosed in applicants co-pending application, Serial No. 311,794,hereinbefore referred to.

' Referring to 1, the lasting units of the machine are indicated at 2,and the operating cam shaft at '4. One of the pattern cams is shown 'atBand the shoe supporting jack at 8. The

shaft Wis driven from a motor I 9 through the driving belt andconnections illustrated in Fig. ll 'At each actuation of the lasting andfeeding devices from the shaft 4, the pattern cam shaft 2!] arranged toact on a plate 22 secured with the shoe supporting jack 8.

' During the operation of lasting the shoe, the

jack is continually forced upwardly by means of a spring 24, arranged'to eirert an upward pressure on the lever 26, the free end of which isconnected by a cord 28 to a vertically movable portion of the jack.Prior to the outward movement of the jack at the end of the lastingoperation, the upward pressure of the spring 24 on the verticallymovable portion of the jack is relieved, as in the machine of the patentand application, this result 'being'accornplished during thestraightening movement of the toggle by the engagement of a set-screw 30on a lever 32 to which the lower toggle lever [B is connected with a lug'34 on the lever 26.

In the machine of the patent and application, the toggle members [4 andI6 are straightened through lever and link connections from a patterncam on the intermittently actuated pattern "camshaft 6. As has beenstated, movement of the toggle to 'a'straighten'ed position isnecessarily jectionable shock or jar.

The pattern cam rapid and takes place during a small number of degreesof rotation of the pattern cam. To stop the members of the toggleaccurately in straightened position, the machines of the patent andapplication are provided with abutments or other devices cooperatingwith the slide 20. In utilizing such devices, however, it was founddifiicult to bring the parts of the toggle accurately to straightenedposition without producing an ob- In the present machine; the sameconnections between the pattern cam and the toggle members are providedfor actuating the toggle, and in order to absorb any shockrorjar, vadash pot is connected to the toggle members and arranged to resist themovement of the toggle members as they near straightened position. Asillustrated, the toggle members i4 and [6 are actuated from a patterncam on the shaft 6 through a pivoted lever 36, provided at its upper endwith a yielding arm 38 connected to the member it of the toggle by alink '46. This arrangement, as in the machine of the patent andapplication, permits the toggle to' flex slightly during the lastingoperation as the shoe supporting jack moves up and down.

The dash pot which absorbs the shock as the toggle members 14 and I6reach a straightened position comprises a casing 42 formed with acylinder 44 in which is mounted a vertically reciprocating piston 46.The lower end of the cylinder 44 is closed by a plug 48 and is providedin its side wall with two perforations 50 and 52 located one abovetheother and connecting with a chamber 54. For convenience of manufacture,the chamber 54 is formed partly-in a removable portion 56 ofthe casing,between which and the main portion of the casing a gasket 58 isinterposed. The plunger '46 extends'upwardly beyond the casing "42 andis connected to the horizontal arm'of a bell crank lever 60, theverticalarm of which is pivotally connected at its upper end to a rod62. The rod "62' passes through a block 64 pivotally mounted on theupper member 14 of the toggle, and is provided at its free end with anabutment collar 66, the construction being such that as the togglemembers 14 and I6 approach straightened position, the block 64 contactswith theblock 66 and through the rod 62 and bell crank lever 69depresses the plunger 46 in the cylinder 44, The downward movement ofthe plunger 46 in the cylinder 44 acts as a shock absorbing dash pot,the downward movement of the piston forcing oil first through bothopenings 5a and 52 into the chamber 54, then through the opening 52alone, and finally coming to rest as the lower end of the piston passesbelow the opening 52'. To easethe suddenness of this stoppage of theplunger 45, the plunger at its lower end oDDOsi-tethe openings 50 and 52is provided with a slightlyv bevelled portion indicated at 68.

While other forms'oi dash pot might be utilized, the dashoot-illustrated has been found to operate satisfactorily, andaccordingly it is pre- 'ferred.'; V

In addition to the features already described, the dash pot oomprises achamber 10 in the removable portion-56 of the casing separated from thechamber 54 by a ibaiile rib 12 and connecting with a chamber H formed inthe main portion of the casing 42 The rib '72 separating the chamberstl-and m terminates slightly short of a rib on the main portion of thecasing so as to leave a slit through whicho'il forced into the.chamberfi t during the downward movement of -theplunger 46 can escapeinto the chambers 70 and 14. To vent the chambers H1 and, M the gasket58 is provided with an opening 16 communicating with a channel 78leading to the outside of the casing. Oil escaping from the top of thecylinder M is allowed to return through'the channel 18. i

As has been stated, the toggle members [4 and I6 are moved from theirstraightened position upon starting the machine by the inward movementof the jack to operative position. To permit the toggle to be brokenwithout interference from the dash pot, the block 64 is permitted toslide on the rod 62 for some distance without actuating the dash potplunger, and thereafter the plunger is raised to itsoriginal position bythe contact of the block 64 with a spring 80 surrounding the rod andinterposed between the block and a collar 82 on the rod.

The novel and improved pattern cam of the present machine for actuatingthe toggle members It and It comprises a cam disk 84 secured to theshaft 6 and a movable section in the form of a lever 86 pivotallymounted upon the disk. The lever 86 is U-shaped, with the two legs ofthe U extending on opposite sides of the cam disk and with the closedend of the U extending beyond the periphery of the disk, where it isprovided with a shallow notch 88 and with a cam surface 86 located toengage a follower 92 at the lower end of the lever 36 which, as has beendescribed, is connected at its upper end to the toggle link It. Thelever 86 is pivotally mounted intermediate its ends on an axis parallelto the axis of the cam disk 84 and is limited in its movement in onedirection by the engagement of the outer end of the lever with ashoulder 94 on the periphery of the cam disk and in the oppositedirection by the engagement of the inner end of the lever with the hubof the disk. A spring 96, coiled around the ends of the pivot pin of thelever, extending across the outer end of the lever and bearing at itsinner ends against the hub of the cam disk, tends to hold the lever withits outer end against the shoulder 9:1, as illustrated in Fig. 3. Duringthe greater part of the operation on the shoe, the lever 85 is out ofcontact with the follower 94. As the cam disk a l makes its next to thelast intermittent movement, however, the notch 88 of the lever movesinto engagement with the follower, as illustrated in Fig. 3. During thenext and final movement of the cam disk, the lever 85 is first swungabout its pivot, thereby forcing the follower outwardly on account ofthe crank effect of the pivot of the lever, and thereafter the levermoves with the cam disk and by means of the surface 90 at the outer endof the lever completes the outward movement of the follower. The surface90 is so shaped that as the cam disk completes its movement the pressureof the follower 92 against the surface is relieved and the lever ispermitted to return to its original position, in which it is out of thepath of the follower when the toggle members are moved from straightenedposition in starting the machine.

The nature and scope of the present invention having been indicated anda specific embodiment of the several features of the invention havingbeen described, what is claimed is:

1. A machine for use in the manufacture of shoes having, in combination,devices for performing an operation progressively along the bottommargin of a shoe, an operating cam shaft and connections for actuatingsaid devices, a shoe supporting jack, means including'a spring exertingan upward pressure on the jack to force the shoe towards said devices, atoggle connected to the spring and arranged to be flexed by the up anddown movements of the jack, a pattern cam acting at the completion oftheoperation on the shoe to straighten the toggle and thereby render thespring inoperative and lock the spring out of operation, and a dash potconnected to the toggle arranged to resist the movement of the toggle asit nears straightened position.

2. A machine for use in the manufacture of shoes having, in combination,devices for performing an operation progressively along the bottommargin of a shoe, an operating cam shaft and connections for actuatingsaid devices, a shoe supporting jack, means including a spring exertingan upward pressure on the jack toforoe the shoe towards said devices, atoggle connected to the spring and arranged to be flexed by the up anddown movements of the jack, a pattern cam acting at the completion ofthe operation on the shoe to straighten the toggle and thereby renderthe spring inoperative and lock the spring out of operation, a dash pot,and a lost motion connection between the toggle and the dash pot tocause the dash pot to resist the movement of the toggle as it nearsstraightened position and permit movement of the toggle fromstraightened position independently of the dash pot.

3. A machine for use in the manufacture of shoes having, in combination,devices for performing an operation progressively along the bottommargin of a shoe, an operating cam shaft and connections for actuatingsaid devices, a shoe supporting jack, means including a spring exertingan upward pressure on the jack to force the shoe towards said devices, atoggle connected to the spring and arranged to be flexed by the up anddown movements of the jack, and means acting at the completion of theoperation on the shoe to straighten the toggle and thereby render thespring inoperative and lock the spring out of operation comprising afollower, and a pattern cam provided with a follower engaging sectionmovable on the cam by engagement with the follower to impart a toggleactuating movement to the follower and thereafter movable with the camto complete the toggle actuating movement of the follower.

4. A machine for use in the manufacture of shoes having, in combination,devices for performing an operation progressively along the bottommargin of a shoe, an operating cam shaft and connections for actuatingsaid devices, a shoe supporting jack, means including a spring exertingan upward pressure on the jack to force the shoe towards said devices, atoggle connected to the spring and arranged to be flexed by the up anddown movements of the jack, and means acting at the completion of theoperation on the shoe to straighten the toggle and thereby render thespring inoperative and lock the spring out of operation comprising afollower, and a pattern cam provided with a follower engaging sectionmovable on the cam by engagement with the follower to impart a toggleactuating movement to the follower.

5. A machine for use in the manufacture of shoes having, in combination,devices for performing an operation progressively along the bottommargin of a shoe, an operating cam shaft and connections for actuatingsaid devices, a

shoe supporting jack, means including a spring exerting an upwardpressure on the jack to force the shoe-towards said devices, a toggleconnected to the spring and arranged to be flexed by the up and downmovements of the jack, and means actingat the completion of theoperation on the shoe to straighten the toggle and thereby render thespring inoperative and lock the spring out of operation comprising afollower, and a pattern cam having pivotally mounted thereon for limitedswinging movement about an axis parallel to the axis of the cam a leverprovided with a follower engaging surface at its outer end and arrangedto be swung by engagement with the follower to impart a toggle actuatingmovement to the follower and thereafter during its movement with the camto complete the toggle actuating movement of the follower.

6.A machine for use in the manufacture of shoes having, in combination,devices for performing an operation progressively along the bottommargin of a shoe, an operating cam shaft and connections for actuatingsaid devices, a

shoe supporting jack, means including a spring exerting an upwardpressure on the jack to force the shoe towards said devices, a toggleconnected to the spring and arranged to be flexed by the up and downmovements of the jack, and means acting at the completion of theoperation on the shoe to straighten the toggle and thereby render thespring inoperative and lock the spring out of operation comprising afollower, and a pattern cam having pivotally mounted thereon for limitedswinging movement about an axis parallel "to the axis of the cam a leverprovided with a shoes having, in combination, devices for performing anoperation progressively along the bottom margin of a shoe, an operatingcam shaft and connections for actuating said devices, a shoe supportingjack, means including a spring exerting an upward pressure on the jackto force the shoe towards said devices, a toggle connected to the springand arranged to be flexed by the up and down movements of the jack, andmeans acting at the completion of the operation on the shoe tostraighten the toggle and thereby render the spring inoperative and lockthe spring out of operation comprising a follower, and a pattern camprovided with a follower engaging section movable on the cam byengagement with the follower to impart a toggle actuating movement tothe follower and thereafter movable with the cam to complete the toggleactuating movement of the follower and a spring to impart a returnmovement to the follower engaging section to remove the section from thepath of the return movement of the follower.

ROBERT H. LAWSON.

